The Skilled Dark Magician and Skilled White Magician are minor villains in Yu-Gi-Oh! GX. They both are minions of the Supreme King.
Both Skill Magicians appearance are pretty much the same, with a few minor differences. They both wear a cloak with a hood that covers most of their faces. Their main differences between the two outfits is that their armors have different colors. Skilled Dark Magician has darker color armor, while the Skilled White Magician has more of a lighter color armor.
Both Skilled Magicians are minions of the Supreme Ruler. When Axel, Aster, and Zane infiltrated the castle the two Skilled Magician were waiting. Both them and Aster dueled each other. They both managed to summon their most powerful monster; Demise, King of Armageddon. However Aster was the victor of the duel.
The theme of the Skilled Magician's decks are unknown but it has something to do with Demise, King of Armageddon.